Perhaps you should try some spelling variations:
"research profession" » "research professional", "research progression", "research professionals"
"research professor" » "research processes", "search processor", "research professional"
"research prozess" » "research progress", "research propels", "research processes"
"research process" » "research progress", "research projects", "research problems"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("research professor") OR ("research profession"))) OR ("research prozess"))) OR ((("research process") OR ("research project")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"research professor\") OR (\"research profession\"))) or (\"research prozess\"))) or (((\"research process\") or (\"research project\"))))".
• Removing quotes may allow a broader search: (((((( research professor ) OR ( research profession ))) or ( research prozess ))) or ((( research process ) or ( research project )))).
• Adding a wildcard symbol may retrieve word variants: (((((("research professor") OR ("research profession"))) or ("research prozess"))) or ((("research process") or ("research project"))))*.